Thanks clayne, yes I have seen that article.

Just a bit of a side note. I had a camera looked at by a local gent, who was a trained Leica repairer. I was shocked and then suprised that he actually uses household Window cleaner on lens elements (in Australia, the common brand of Windex). He doesn't spray it on like you were doing your windows. Just a tiny dab enough to make a soft cloth damp was all that he used. Apparently it is the best thing to help preventing fungus re-appearing.

So, yes, I will be taking the camera to him.